//
//  UIBarButtonItem+Extension.swift
//  我的微博
//
//  Created by Creator on 15/10/20.
//  Copyright © 2015年 Creator. All rights reserved.
//

import UIKit

extension UIBarButtonItem {

    
    ///  UIBarButtonItem
    ///
    ///  - parameter imageName: 图像名
    ///  - parameter target:    目标对象
    ///  - parameter action:    调用方法名
    ///
    ///  - returns: UIBarButtonItem
    convenience init(imageName: String, target: AnyObject?, action: String?) {
        
        let button = UIButton()
        
        button.setImage(UIImage(named: imageName), forState: UIControlState.Normal)
        button.setImage(UIImage(named: imageName + "_highlighted"), forState: UIControlState.Highlighted)
        button.sizeToFit()
        
        // 设置监听方法 判断 action 是否存在
        if let actionName = action {
            
            button.addTarget(target, action: Selector(actionName), forControlEvents: UIControlEvents.TouchUpInside)
        }
        
        // 调用指定的构造函数
        self.init(customView: button)
        
   
    }
    
    
}
